We created the following directory:
-bash-2.05b# mkdir /opt/oracle/product/9.2.0/rdbms/public

and we copied the missing files from the archive located on the second Oracle Linux CD: /mnt/cdrom/Disk2/stage/Components/oracle.rdbms.oci/9.2.0.4.0/1/DataFiles/public.1.1.jar to the folder: /opt/oracle/product/9.2.0/rdbms/public